function addClass(ele,cName) { var arr = ele.className.split(' ').concat(cName.split(" ")); for(var i=0;i<arr.length;i++){  for(var k=arr.length-1;k>i;k--){   (arr[k]==="")&&arr.splice(k,1);   (arr[i]===arr[k])&&arr.splice(k,1);  } } ele.className = arr.join(" ");}

function removeClass(ele,cName) { var arr1 = ele.className.split(' '); var arr2 = cName.split(" "); for(var i=0;i<arr2.length;i++)for(var j=arr1.length-1;j>=0;j--)(arr2[i]===arr1[j])&&arr1.splice(j,1) ele.className = arr1.join(" ")}